Self-contained rock-drill.



PATENTED JAN. 8, 1907.

O. G. DURYEA & M. 0. WHITE. SELF CONTAINED ROCK DRILL.

APPLICATION FILED APR.28. 1903.

2 SHEETS-SHEET 1.

No. 841,001. PATENTED JAN 0 O..DURYBA &.M. 0. WHITE. SELF CONTAINED ROCK DRILL.

APPLICATION FILED APR.28,1903,

2 SHEETSSHEET 2.

V ME/ gl/pllfflflllff/ll//ll rl1ll:lid

News mus um Luna wnswmm n L UNITED v STATES ASSIGNORS TO NATIONAL CALIFORNIA.

Specification of Letters Patent.

PATENT ori ioni OTHO C. DURY-EA MORRIS C. WHITE, OF LOS ANGELES, CALIFORNIA, GAS DRILL COMPANY, A CORPORAZPION OF SELF-CONTAINED ROCK-DRILL.

Patented Jan. 8, 1907.

Application filed April 28, 1903. Serial No. 154,678.

To all whom it may concern:

Be it known that we,.OTHo O. DURYEA and MORRIS 0. WHITE, both citizens of the United States, residing at Los Angeles, in the count of Los Angeles and State of California,

in the nited States of America, have invented a new and useful Self-Contained Rock- Drill, of which the following is a specification.

Our invention relates to a rock-drill which is entirely self-contained and has two connected pistons, or what might be termed a used for power-hammers, air-cr.-. npress0rs,

free-moving double piston, which is reciprocated by the explosion of a suitable fuel.

This invention is characterized by the total absence of fly-wheels, auxiliary motors, cams, or other rotating or inertial devices, cranks, levers, returning-springs, or the like,

the engine being unconnected with any me- 'chanical device for. operating the piston through a Whole stroke or part of a stroke either by inertial effect, by the elasticity of arts, or by any counterbalancing weights. he movement of the piston. is entirely unimpeded, and the power from the explosion is utilized to a high degree and applied to the work in a direct manner.

The free piston-engine is adapted to be pumps, riveters, chippers, pile-drivers, rockdrills, chines.

The construction of this engine is such that its movement is under perfect control and may be quickly accelerated or retarded, as desired. The engine has a cushioned stroke and is susceptible of some variation in the length of stroke, which makes the engine particularly ada ted for percussive work .This rock-dril is particularly efficient, as it is self-contained, the mechanism for generating the power being contained. entirely withiri'the drill itself, the energy not being produced in extraneous devices, such as reuirecl by rock drills using air-compressors, e ectric generators, or the like. I Referring to the drawings, Figure I is transverse sectional view on line-I I, Fig. IV. Fig. II is a transverse sectional view taken on line II II, Fig. IV. Fig. III is a transverse sectional viewtaken on line III III, Fig. IV. Fig. IV is a longitudinal sectional viewthrough the invention applied as a rockdrill, the electrical connection for operating and other reciprocatory tools or mathe sparker being shown in diagram. Fig. V is a horizontal sectional View taken longitudinally through the drill. Fig. VI is a transverse sectional view taken on line VI VI, Fig. IV.

In the form shown this rock-drill comprises tandem cylinders 1 and 2, which are mounted on a casing 3. Pistons-4 and 5 in cylinders 1 and 2 are connected by a pistonrod 6, which carries a yoke 7, the latter being connected with a socket-shank 8 by means, of slide-rods 9 and a front yoke 10; 11 and 12 are inlet puppet-valves for compressionchambers 13 and 14, respectively, and the explosive mixture "is supplied to the puppet valves fi'om'a passage 15, which communicates with an inlet 16, as shown in Figs. I and VI. The explosive mixture is sucked alternately into the compression -chambers 13 and 14, and as the respective pistons recipro cate they open and close ports 17 and 18 alternately, and the explosive mixture is thus admitted alternately into cylinders 1 and 2 and there compressed and ignitedfrom sparking plugs 19 and 20.

' The compression of the explosive mixture Within the cylinders cushions the stroke after the manner set forth in'our co ending application, Serial No. 100,302, ed March 27, 1902, in which we have claimed certain features of invention shown herein, but not herein claimed for'the reason that same are claimed in said a plication. In said applicationwe have sliown a cylinder, a piston thereinya second cylinder axially in line with said first cylinder, a second piston in said second cylinder, a rod connecting said pistons, a yoke carried by'said rod, tool-carrying means axially in line with said cylinder, a

head carrying said tool-carrying means, a connection between said head and said yoke, and means for causing an explosion of gases against first one piston and then the other piston to reciprocate said piston and its attached arts, and a casing carrying said cylinders 1s slidably mounted in a frame-and moved therein by a screw, as shown in this application; but no claim to the structure shown in said former ap lication ismade herein, for the reason that the same is claimed therein, this application beingfor an improvey 1'05 ment over the subject-matter of said former application. After the ignition the explodcd mixture passes from the cylinders al- 'tennately through ontlet-ports 21 and 22 as and 22 he nearer the heads of their respective c linders than do the inlet-ports 17 and 18.

'- his allows much of the exploded gases to exhaust from the cylinders before fresh charges enter.

i 7 designates oil-tubesfl'for the respective cylinders. Sparlccoils 28jand 29 are pro vided for the sparking plugs 19 and 20, one pole of the secondary of a coil being connected to its sparking plug while the other pole is grounded. to the frame. One ole of the primary of a coil is grounded to tv e frame of the drill, the other ole being connected to a spr1ng-contact wit iin the casing 3. The primary of the coil 28 is connected to contact 30,while the primary of coil 29 is connected to contact 31. As the yoke 7 reaches the end of each stroke it carries a blade 32 into contact with one or the other of the spring-con tacts 30 and 31. l Vhen the blar e 32 contacts with. contact 30, it closes the primar circuit through coil 28 and produces a sparli at sparking plug 19, while when'it is in contact with contact 31 it closes the primary:

circuit through coil 29 and produces a spark at sparking plug 20. Thus impulses are given alternately to the pistons, one exp lo' sion at each end of the stroke.

, The socket-shank 8 is .revolubly mounted inithe front yoke 10, as shown in'l 'igs. IV and V,and is rifled, as at v32 3.

spondingly-rilled ratchet 34-, which is rotatably mounted in the end of the front of the casing 3, Eawls are pivoted in recesses in theicasing 3 and engage the ratchet 34 and prevent rearwardrotation of the ratchet 34, and. the socket-shank is reciprocated in one direction. by reason of the friction be tween the socket-shank and front yoke 10, together with the a stability of the socketshank, it turns thcratchet forward the rifled portion of the socketshank slides through the socket-shank. When the socketshank slides in the opposite direction, the pawls 35 prevent rearward movement of the rifled ratchet 34, which causes the socketshank 8 to be partially rotated as it is retracted, and the toolatt'ached to the socketshank' is "thereby turned step by step during the work.

Both cylinders are suitably waterj ackctcd, as at 36, and in order to supply water to cool The rifled portionof the sockct-shank is mounted In a corre- I the tool the socket-shank may be made hole low, as shown in Figs. IV and V A station ary tube 3'1, one end of which may communis cate with the water-jacket 36, ma -b "e slidabl and will convey water from the water acket 36 to the interior of, the sockeksha and shank freely telescopes with thetube 37.-

The casing 3 may be slidabl 'mount ed; -in ways formed in a stationary rame=38 "and maybe moved back and forth along the chambers. 'The space between the two compress'ion-chambers at the top may be pro s moving the same access may be had to the interior. The piston-rod 6 is preferably fasscrew-threads 48', which are received by the yoke.

I 49 IS a taper-pin. which passes through the yoke and piston-rod 6.

which the yoke abuts.

and 14 receive threade plugs 51and; 52, re

readed stems, whichcarry packing-boxes Letters Patent of theUnited States, is-

tons, larca'sing connected with the cylinders, a socket-shank rotatably mounted and con- 'nected to reciprocate with said reciprocating means, a rifled sleeve rotatably mounted slidable in the rifled sleeve, means for confining the rotation of the sleeve to one direction and means for causin explosions against said pistons to drive t em in one and the other direction.

2-. A painof cylinders, pistons therein,

fitted within the hollow soc 'et shanki frame 38 by means ofa screw 39, which is' formed in the side of, the wall which inclos'esthe space between the two compression.

vided with a removable cover 47, and by re-' tened to the yoke 7 by being provided with.

1. A pair of cylinders, pistons therein, reciprocating means rigidly connectingthe pisthence to the tool. Injworking the'socket shank o the handle 45 sliding in a slot. 46,-

' 50 is a fiangeon the piston-rod 6, against The heads of the com ressionvchalinbers 13 I spectively, and the plugs are; providedwith, t 53. The plugs 51 and 52 may be removed 1 5- What weclaim, and desire to secure by in said casing, spiral ribs on the socket-shank. v

means connecting the pistons, a casing confront of the casing, arified socket-shank roitatably' mounted-in means connected with the pistons, and means for confining the rotation of the ratchet to one-direction.

3. A pair of cylinders, means for causing explosions against-thepistons to drive the same in one and the other direction, pistons therein, a piston-rod connecting the pistons, a yoke attached to thepiston-rod, a casing extending forward from the front 0 linder, a pair of slide-rods connected to sai yoke, a

ontyoke inside of said casing connected'to said slide-rods, a socket-shank rotatably for'intermittently rotating the shank.

5. A pair of cylinders, explosion-chambers c'ommiinicat' therewith, pistons in the respective cylin ers, means for causing-explosions a ainst the pistons to drive the same in one an the other direction, a piston-rod conthe res ctive explosion-chambers concentric wit said iston-rod, said lugs being rovided with t eaded stems and ox screwdd to each of said stems ashank, means connecting the shank with thepisthe shank.

In testimony whereof I have signed my name to this-specification, in the presence of a packing-t shank connected with said yoke, and means" necting thepiston, screw-plugs in the-wall of tons, and means for intermittently rotating two subscribing witnesses, at Newark, in the mounted in the front yoke, a rifled ratchet ro county of Essex and State of New Jersey,

tatably mounted in the front end of said casing, spiral ribs on-fthe socket-shank passing through the rifled ratchet and means or confining the rotationofthe ratchet to one direction.

4. A pair of cylinders, explosion-chambers communicating therewith, pistons in the re spective cylinders, means for causing explosions against the pistons to drive the same in one and the other direction, apiston-rod connecting the piston, screw-plugs in the walls of the respective explosion-chambers concentric with said piston rod a yoke connected with the piston-rod between the plugs, a

this 27th day of April, .1903.

OTHO O. DURYEA...

Witnesses-z f CEcInH. MACMAHON, NEWTON P. KiNsEY. 7

In testimony whereof I have signed'my name to this specification, in the presence of tWd'Subscribing witnesses, at Los Angeles, in' the county of Los Angeles and State of Cali fornia, this 20th day of A ril, 1903.

. MOR IS C. WHITE.

Witnesses:

Gnonen T. HACKLEY, JULIATO NsEND. 

